Electric-arc lamp.



A. BLONDEL 8: GLDOBKEVITGH. ELECTRIC ARC LAMP. APPLICATION FILED Dno.1e,'19os. RENEWED DBO. 19. 1911.

1,019,731. Patented Mar. 5, 1912.

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A. BLONDEL & G. DOBKEVITCH.

ELECTRIC ARC LAMP. 7 APPLICATION FILED DEO.16,1906. RENEWED D20. 19,1911.

1,019,731 Patented Mar. 5, 1912 a SHBETSSHEET '2.

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A.- BL0NDEL -& (3., DOBKEVITGH.

ELECTRIC ARC LAMP. APPLICATION FILED DEO.16, 1905. RENEWED D30. 19,1911. 1,019,731 Patented Manfi, 1912.

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WITNESSES; \NVENTOF'LS,

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UNITED, STATES PATENT OFFICE;

Arman BLONDEL AND GAETAN nonxnvrron, or rears, FRANCE, assronons, BYMESNE ASSIGNMENTS, r0 GENERAL. ELECTRIC COMPANY, A CORPORATION on NEWYORK.

Specification of Letters Patent.

ELECTRIC-ARC LAMP.

Patented Mar. 5, 1912.

Original application filed February 1, 1905, Serial No. 243,774. Dividedand this application filed December 16, 1905, Serial No. 291,982.Renewed December 19, 1911. Serial No. 666,844.

To, all whom it may concern:

Be it known that we, ANDRE'E BnoNon'L, citizen of the Republic ofFrance, and

GAii'rAn DoBKnvrroH, a subject of the Russian Emperor, both residing atParis,

France, have invented new and useful 1111- provements inElectric-Arc'Lamps; and we do hereby declare the following to be a full,I clear, and exact description of the same, the

present application being a division of our prior application, SerialNo. 243,774, filed February 1,1905.

Our present invention relates to electric arc-lamps, especially" thoseusing mineral-- ized electrodes, the object being to provide meanswhereby the .loss of voltage, caused by the use of mineralizedelectrodes of high I resistance and comparati'vely great length, iscompletely avoided, so that arc-lamps of very low voltage (say 26 to 28volts) .may be obtained with a uniform operation.

In practice, we attain the object of our invention by the use ofspecially constructed conducting members, connectedto the electric wire,and comprising rings which surround the carbons in such manner that saidconducting members .are lowered together with the carbons, which mayfreely pass through said rings of the conducting members at the end ofthe'movement of said members.

' In the acco'mpanyin drawings we have shown several forms 0 embodimentof our invention.

Figure 1 shows the upper carbon of a lamp provided with ourimprovements; Fig.

- 2 is the plan view of one of the conducting g of the structure shownin'Fig. 1; Fig; 4 1s members surrounding and carried by said carbon;Fig. 3 is a vertical section Showing certain parts in elevation ofamodification a lan of one of the conducting members of Flg. 8; Fig. 5 isa modification of the structure shown in Fig. 4; Figs, 6 and 7illustrate still another modification of our invention; Figs. 8 and 9show a modification wherein guide rings on either side of .theconducting ring 3 surround the guide rods;

Fig, 10 shows a modification illustrating a convenient mode ofinsulating the connectingmember from the guide rod; ,Fig. 11

shows the position of'the carbon surround iurthermore be guided alonguide-rods $10 of the lamp, and for this or be replaced sumed, igs, 12to 15 show details of our invention; Fig. 16 shows our improvementapplied to a lamp using converging electrodes; Fig. .17 shows ourimprovement appliedto a lamp using upper and. lower electrodes; Fig. 18is a plan view of the lower conducting member shown in Fig. 17.

Like numerals refer to like out all the views.

Referring particularly to Figs. 1 and 2, 1 represents the upper carbonof a lamp secured to the carbon holder 2, the latter being attached to achain, 2, or the like, in

thewell known way. Slipped over the carbon 1, are conducting members 4comprising rings 3 the diameter of which is a little larger than thediameter of the carbon 1.-

To the end of, thestem of each conducting member is attached asuitable-weight, such parts through as 5, whereby the ring is'clamped onthe carbon, as shown, until it comes into contact with an upperprojection on a plate 6, arranged above theusual economizer of thelamp.v Said conducting members are arranged at suitable intervals alongthe carbon 1, and the'rings thereof are shown electrically connected toeach other by means of a flexible wire or connection 7 the upper end ofwhich is attached to a projection 8, carried by the carbon-holder 2, andto which the electric current is brought through a wire 9. It willbeunderstood that by this arrangement of .the conducting members, theelectric current is brought directly to the lower end of the'carboninstead of being caused to pass through the entire carbon as in ordinarylamps. lowered accordin to-the consumption thereof, the weighte ends 5are successively brought upon the plate 6 and piledupon one another, andthe rings 3 are disengaged from the carbon (see also Fig. 10), so thatthe latter may freely pass through the rings. -When the carbon is againtemporarily raised, the uppermost conductingmember is carried away withit, as will be easily under stood. The conducting members 3 may theusual The carbon 1 being purpose the wei ht 5 may be in the form oftriccurrent may also be brought to the I guide-rod 10.

In this case, the latter is suitably insulated from the frame of thelamp and the inner sides of the guide-rings 11 are provided withcontact-springs 12 (Fig. pressing constantly against said guide-rod.When the guiderods are not insulated from the frame of the lamp, the

rings 11 are preferably provided with insulating material, such asporcelain, or made entirely of insulating material.

In another embodiment, the conducting members may comprise yokes or openrings (see Figs. 6 and 7), the ends of which are provided with a pin 13,acting as arpivot for the end of an arm' 14, the opposite end of whichcarries the insulated guide-ring 11, surrounding the guide-rod 10. Thecontactring 3 is slidably clamped in position on V the carbon 1 by thepressure of the downwardly projecting extension 15 of said arm 14. Fig.8 shows a similar arrangement, wherein the contact-ring is composed oftwo sections, 3 and 3, connected by pins 13, 13, carrying the arms 14:,14: provided with guide rlngs 11', 11 each of which embraces" togetheron opposite sides by means of pins 17 and provided. with grippingcontactpieces 18, 18, pressing upon the carbon 1..

In practice, it will of course be more convenient to have the guide-rods10 not insulated from theirame of the lamp, and instead ofusingJguide-rings made of porcelain or other insulating material we mayuse the device shown in Fig- 10. In this modification, the directcontact part is formed of a"rectangular' plate 19, provided with acentral hole 20to fit around the carbon and a vertically projectingbranch or plate21, to which are attachedthe ends of a rod or wire 22,curved to fit around the guide-rod 10 and provided with a plurality ofinsulating balls, such as beads23 strung upon the rod or wire, wherebythe contact-plate 19,

carried by the carbon 1 is insulated from the rod 10 and the frame ofthe lamp, the electric current being brought to said con-- tact-platethrough the wire 7 as already described in connection with Fig. 1. n

Fig. 11 shows the shape and nesting of successive plates .19 carried bythe carbon 1, and bringing the current to the neighborhood of the freeend thereofras shown the plates are successively deposited upon theeconomizer 2d of the lamp, when the carbon 1 is lowered according to theconsumption. The contact-plates 19 shown in Figs. 12, 13, 14 and 15, areprovided with silver contacts 25 through which the current is 'bon sofar as it is allowed by the brought to, the carbon 1. In Fig. 15 theplate is insulated from the guide-loop'26 by means of a sheet of mica27, the guide-loop being made of metal.

Fig. 16 shows an arc-lamp embodying inclined electrodes 1,, each ofwhich is provided with a plurality of contact members having rings 3,whereby the electric current is brought to the neighborhood of the freeends of said-electrodes .1.

In another arrangement of lamp shown in Fig.1? the upper carbon 1 isprovided with a plurality of contact members such as contact-plates 19,guided along the guide-rod 100i the lamp and electrically-connected toeach other by means of wires .7, also provided with suitable insulatingballs or the like. The lower carbon 28 in this instance) is alsoprovided with a conducting member, such as contactplate '19 (Fig.17)'pro'vided with a suitable weight 29', whereby-said plate is clampedonthe carbon 28, while it is guided along the lower guide-rod of thelamp. The carbon 28 being raised,the end of the plate 19 will engage thelateral extension 29 of'the lower carbon-guide 30, whereby said plate 19will be disengaged automatically and drop again alon the car-' Iength ofthe wire 7. The'contact plate 19 (just mentioned) 'may also be providedwith anextension 31, adapted to engage the economizer 2a of the lampwhen the carbon 28 is raised .to a givenextent, in order to disengagesaid plate automatically from the carbon 2S.'

It is evident that other changes and modifications in the constructionof said contact means may be resorted to, without depart 'ing from thescope or sacrificing any of the advantages of'the invention.

Thisapplication is a division of an aplication, Serial No. 24377 1,filed by us on ebruary 1, 1905, for Letters Patent o'f'the UnitedStates.

Having fully described our invention,

what we claim and desire to secure by Letters Patent is a 1. In an arclamp, thecombin'atiomwith a carbon, of a plurality of current-conductingdevices arranged along thecarbon and having a loose clamping engagementwith said carbon,- aprotecting plate arranged 'in close proximity to thefree end of said carbon for from the carbon when brought intoengagedisengaging the current-collecting devices ment with saidprotecting plate, and means 1 for electrically connecting saidcurrent-conducting devices to each other and to a main conductor.

2. In an arclamp, the combination, with a carbon, of a plurality ofcurrent-conducting devices each comprising a ring surrounding the carbonand carrying a weight, a horizontalprotecting plate arranged in closeproximity to the free end of said carbon for from the carbon whenbrought into engagement with said separating plate, and means for"electrically connecting said current-conducting devices to each otherand to a main conductor.

3. In an arc-lamp, a lamp frame having a vertical rod, in combinationwith a carbon, a plurality of current-conducting rings arranged alongand surrounding the carbon, a laterally projecting stem on each ring, aweight at the free end of said stem, a horizontal protecting platearranged in .close proximity to the free end of said carbon, for

automatically disengaging the rings from the carbon when the weightsaforesaid are "brought against the protecting plate, means forelectrically connecting said rings to each other, and means for guidingsaid rings along the aforesaid Vertical rod of the lamp frame,substantially as set forth.

4.. In an arc lamp, the combination, with 'a carbon, of a plurality ofcurrentconducting rings arranged along and surrounding the carbon, alaterally projecting stem on each ring, a guiding loop on the free endof each stem and insulated from the ring, a horizontal protecting platearranged in closeproximity to thefree end of said carbon forautomatically disengaging the rings from the carbon when brought againstthe protecting plate, a rod constituting part of the frame of the lampand loosel engaging the guiding loops, and means or electricallyconnecting said rings to each other, substantially as. set forth.

5. In an arc lamp, the combination, with a carbon, of a plurality ofcurrent-conducting rings arranged along and surrounding the carbon, astem pivoted to and laterally projecting from each ring, a movable dogon each stem and engaging the carbon, 2. guiding loop or ring on theopposite end of the stem, a horizontal protectin plate arranged inclose-proximity to the rec end of said carbon for automaticallydisengaging the rings from the carbon when brought against theprotecting plate, a rod constitutin part of'the frame of the lamp andloosey engaging the guiding loops, and means for electrically connectingsaid rings to each other, substantially as set forth.

In testimony whereof, we have signed our names to this specification inthe presence of two subscribing witnesses.

ANDRE BLONDEL.

GAFLTAN DOBKEVITOH.

Witnesses as to A. B:

Louis GASTIMAN, FRANK H. Mason. Witnessesas to G. D.: FRANK H. MASON,

' FREDERIG W. CAULDWELL.

